geolimits

Read a spreadsheet containing tsunami (tidal wave) events into the workspace as a table. The Latitude and Longitude table variables contain the locations of the tsunami events. The MaxHeight table variable contains the maximum heights of the tsunamis.

T = readtable("tsunamis.xlsx");

lat = T.Latitude;
lon = T.Longitude;
sz = T.MaxHeight;

Display the data using a geographic bubble chart over a terrain basemap. Specify the bubble sizes using the tsunami heights. Change the title of the size legend using the SizeLegendTitle name-value argument.

geobubble(lat,lon,sz,"SizeLegendTitle","Maximum Height")
geobasemap colorterrain

Zoom into a region containing British Columbia and the western United States by changing the latitude and longitude limits.

geolimits([28 65],[-158 -100])

To maintain the aspect ratio of the latitude and longitude axes, the geolimits function typically uses limits that cover a larger region than the limits you specify. Query the actual limits of the map.

[latitudeLimits,longitudeLimits] = geolimits

latitudeLimits = 1×2

   28.0000   65.0000

longitudeLimits = 1×2

 -159.0627  -98.9373

Load a MAT file containing coordinates for the perimeter of the contiguous United States into the workspace. The variables within the MAT file, uslat and uslon, specify numeric latitude and longitude coordinates, respectively. Display the coordinates over a topographic basemap.

load usapolygon.mat
geoplot(uslat,uslon)
geobasemap topographic

Query the latitude and longitude limits.

[latitudeLimits,longitudeLimits] = geolimits

latitudeLimits = 1×2

   17.3588   54.6665

longitudeLimits = 1×2

 -126.1638  -65.5263

Use manual mode to maintain the current latitude and longitude limits when you add more plots to an axes.

Read a spreadsheet containing cell tower data into the workspace as a table. The Latitude and Longitude table variables represent the locations of the cell towers. Display the tower locations using point markers over the grayland basemap.

load cellularTowers.mat
lat1 = cellularTowers.Latitude;
lon1 = cellularTowers.Longitude;

geoscatter(lat1,lon1,".")
geobasemap grayland

Load a MAT file containing coordinates for each contiguous US state into the workspace. The MAT file contains a structure array with latitude and longitude fields. Extract the latitudes and longitudes from the structure array.

load usastates.mat
lat2 = [usastates.Lat];
lon2 = [usastates.Lon];

Set the geographic limits mode to manual so that the limits do not change. Use hold on to add a second plot to the axes.

geolimits manual
hold on
geoplot(lat2,lon2)

The limits do not update to incorporate the new plot.

Switch back to automatically updated limits by resetting the mode to automatic.

geolimits auto